Date: Tue, 8 Feb 2000 11:10:24 +0100 (CET) From: Jakob Alvermark <jakob@teligent.se> To: "Kenneth D. Merry" <ken@kdm.org> Cc: scsi@FreeBSD.ORG Subject: Re: Problems with Adaptec card and FreeBSD 2.2.2 (fwd) Message-ID: <Pine.BSF.4.10.10002081058290.78201-100000@teligent.se> In-Reply-To: <20000207133426.A23334@teligent.se>
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On Mon, 7 Feb 2000, Kenneth D. Merry wrote:
> On Mon, Feb 07, 2000 at 08:02:21 +0100, Jakob Alvermark wrote:
> > Maybe someone on this list can help me with this problem?
> >=20
> > There are two different card models, "2940 UW" and "2944 AU".
> > And I know that 2.2.2 is quite old, but we can't just reinstall all the
> > machines in a snap. This is a large and complex telecommunications syst=
em
> > with several machines running FreeBSD, and over two million customer, s=
o
> > you see my problem.
>=20
> I'll repeat my answer for the benefit of the folks on -scsi:
>=20
> > On Thu, 3 Feb 2000, Peter Schwenk wrote:
> >=20
> > > You neglected to tell us the model of Adaptec SCSI card you are using=
=2E Also,
> > > you do realize that FreeBSD 2.2.2 is a bit old. The last version of =
the 2.x
> > > line was 2.2.8.
> > >=20
> > > Jakob Alvermark wrote:
> > >=20
> > > > Hi All.
> > > >
> > > > We are having problems with FreeBSD 2.2.2 and some Adaptec SCSI car=
d.
> > > > This is the errors showing on the screen:
> > > >
> > > > "Timed Out in dataout phase.
> > > > SCSISIGI=3D0xe6
> > > > SEQADDR=3D0x133
> > > > SCSISEQ=3D0x12
> > > > Issued Cannel A bus reset.
> > > > 2 SCB's aborted "
> > > >
> > > > "The SCSI bus had locked up or lost connection with the harddrive
> > > > again."
> > > >
> > > > I have only heard a rumor that there might be a problem with FreeBS=
D 2.2.2
> > > > and the Adaptec SCSI cards and heavy load. Is this true?
> > > >
> > > > This has happened to several machines. It seems to happen about onc=
e every
> > > > week. The machines have quite heavy load at times.
> > > >
> > > > Is this a known problem? How to fix? Change SCSI-card to a differen=
t
> > > > brand? Upgrade to a newer release of FreeBSD?
>=20
> The "timed out in {datain|dataout|command}" phase messages almost always
> mean there is a cabling or termination problem on the bus. It means a
> signal got stuck on the bus somewhere.
>=20
> There were certainly bugs in the old SCSI layer that could get triggered
> under heavy load, but this isn't one of them.
>=20
> These sorts of problems can be intermittent, so it isn't surprising that
> you see them once a week under high load.
>=20
> The new Adaptec driver and the CAM SCSI layer handles problems like this =
a
> little better, but there are still no guarantees when signals are getting
> stuck on the bus.
>=20
> So check your cabling and termination.
I have checked all the cabling and termination on one of the machines
(which was sent to me). Everything seems ok, there is only one disk, which
is terminated, and one cable. The SCSI-card itself was set to automatic
termination, could that be a problem?=20
I was able to reproduce the problem by creating a number of processes that
reads and writes a lot on the disk. After a couple of hours the machine
froze and showed the above message.
I have now changed the termination on the card to "ON", and running the
same test.
Thanks,
=09Jakob Alvermark
-------------------------------------------------------
Teligent AB, P.O. Box 213, S-149 23 Nyn=E4shamn, Sweden =20
Telephone +46-(0)8 520 660 00 * Fax +46-(0)8 520 193 36=20
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